I found answers for my quastions:
4 - I can not see planned order in MD04, because MRP area defined for one storage location. But storage location in planned order is differend. So if I manually put right storage location in planned order - I can see it in MD04.
Planned order did not create, because in VIEW3 I have Strategy group 11, and Mixed MRP -2. So I put Strategy group 10 without Mixed MRP - it works correct.
And Strategy group 11 can not create Planned orders for both requirement: independent and dependent.
So I will use Str. group 10.
5 - Old orders did not deleted because of my first reason above.